diff options
| -rw-r--r-- | libc/sysdeps/linux/i386/Makefile | 4 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/__longjmp.S | 40 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/jmp-unwind.c | 29 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/longjmp.c | 51 |
4 files changed, 122 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile index d54c78d8b..45aa84777 100644 --- a/libc/sysdeps/linux/i386/Makefile +++ b/libc/sysdeps/linux/i386/Makefile @@ -28,13 +28,13 @@ ASFLAGS=$(CFLAGS) CRT0=crt0.S CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0)) -SSRC=longjmp.S setjmp.S vfork.S #_start.S #clone.S +SSRC=__longjmp.S setjmp.S vfork.S #_start.S #clone.S ifeq ($(UNIFIED_SYSCALL),true) SSRC += __uClibc_syscall.S endif SOBJS=$(patsubst %.S,%.o, $(SSRC)) -CSRC=__init_brk.c brk.c sbrk.c +CSRC=__init_brk.c brk.c sbrk.c longjmp.c #jmp-unwind.c COBJS=$(patsubst %.c,%.o, $(CSRC)) OBJS=$(SOBJS) $(COBJS) diff --git a/libc/sysdeps/linux/i386/__longjmp.S b/libc/sysdeps/linux/i386/__longjmp.S new file mode 100644 index 000000000..484a564c3 --- /dev/null +++ b/libc/sysdeps/linux/i386/__longjmp.S @@ -0,0 +1,40 @@ +/* longjmp for i386. + Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#define _ASM +#define _SETJMP_H +#include <bits/setjmp.h> + +.globl __longjmp; +.type __longjmp,@function +.align 4; \ +__longjmp: + movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */ + movl 8(%esp), %eax /* Second argument is return value. */ + /* Save the return address now. */ + movl (JB_PC*4)(%ecx), %edx + /* Restore registers. */ + movl (JB_BX*4)(%ecx), %ebx + movl (JB_SI*4)(%ecx), %esi + movl (JB_DI*4)(%ecx), %edi + movl (JB_BP*4)(%ecx), %ebp + movl (JB_SP*4)(%ecx), %esp + /* Jump to saved PC. */ + jmp *%edx +.size __longjmp,.-__longjmp; diff --git a/libc/sysdeps/linux/i386/jmp-unwind.c b/libc/sysdeps/linux/i386/jmp-unwind.c new file mode 100644 index 000000000..083dc74a8 --- /dev/null +++ b/libc/sysdeps/linux/i386/jmp-unwind.c @@ -0,0 +1,29 @@ +/* _longjmp_unwind -- Clean up stack frames unwound by longjmp. Stub version. + Copyright (C) 1995, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <setjmp.h> + +void +_longjmp_unwind (jmp_buf env, int val) +{ + + /* This function can perform any cleanups necessary to safely unwind the + stack frames around the current context which ENV unwinds past. */ + +} diff --git a/libc/sysdeps/linux/i386/longjmp.c b/libc/sysdeps/linux/i386/longjmp.c new file mode 100644 index 000000000..97a37e350 --- /dev/null +++ b/libc/sysdeps/linux/i386/longjmp.c @@ -0,0 +1,51 @@ +/* Copyright (C) 1991, 92, 94, 95, 97, 98 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <stddef.h> +#include <setjmp.h> +#include <signal.h> + + +extern void _longjmp_unwind (jmp_buf env, int val); +extern void __longjmp(__jmp_buf __env, int __val) + __attribute__ ((__noreturn__)); + +/* Set the signal mask to the one specified in ENV, and jump + to the position specified in ENV, causing the setjmp + call there to return VAL, or 1 if VAL is 0. */ +void +__uClibc_siglongjmp (sigjmp_buf env, int val) +{ +#if 0 + /* Perform any cleanups needed by the frames being unwound. */ + _longjmp_unwind (env, val); +#endif + + if (env[0].__mask_was_saved) + /* Restore the saved signal mask. */ + (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask, + (sigset_t *) NULL); + + /* Call the machine-dependent function to restore machine state. */ + __longjmp (env[0].__jmpbuf, val ?: 1); +} + +__asm__(".weak longjmp; longjmp = __uClibc_siglongjmp"); +__asm__(".weak _longjmp; _longjmp = __uClibc_siglongjmp"); +__asm__(".weak siglongjmp; siglongjmp = __uClibc_siglongjmp"); +__asm__(".weak __sigprocmask; __sigprocmask = sigprocmask"); |